Eunji Cha suffers from an undiagnosed medical disorder and frequently experiences violent seizures. After enduring years of abuse by her parents she wakes up from one particular episode and discovers the horrible truth behind the peculiarities of her family. The scars left on her mind after that day forever shape her character as she battles her inner demons and tries to keep her fiendish desire to murder at bay. Years down the road, her fate becomes intertwined with a man whose very nature is a stark reflection of her own. Will Eunji be able to contain the darkness within her? And will she come out on top in this perilous game of cat-and-mouse?